{"id":"CVE-2026-71485","state":"PUBLISHED","title":"Centrifugo: Client-forgeable headers emulation lets any client spoof headers forwarded to proxy backends","description":"Centrifugo is an open-source scalable real-time messaging server. Prior to 6.9.0, Centrifugo copies the client-controlled protocol.ConnectRequest.headers map through OnClientConnecting in internal/client/handler.go, ConnectEvent.Headers, and SetEmulatedHeadersToContext. The requestHeaders path in internal/proxy/http.go, the requestMetadata path in internal/proxy/grpc.go, and the Consume path in internal/unigrpc/grpc.go can forward an allowlisted value as a trusted backend header or metadata value. A remote client can spoof a header such as x-trusted-user for connect, refresh, subscribe, publish, RPC, and related proxy calls when the backend relies on that header for authentication or authorization. The unidirectional gRPC transport has no transport-level HTTP header that can override the emulated value. This issue is fixed in version 6.9.0.","publishedAt":"2026-08-20T21:01:00.931Z","updatedAt":"2026-08-25T15:23:47.006Z","severity":{"score":9.1,"label":"Critical","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["centrifugal centrifugo"],"affected":[{"vendor":"centrifugal","product":"centrifugo","versions":[{"version":"< 6.9.0","status":"affected"}]}],"references":["https://github.com/centrifugal/centrifugo/security/advisories/GHSA-9468-v6mj-fppw","https://github.com/centrifugal/centrifugo/pull/1182","https://github.com/centrifugal/centrifugo/commit/84d38cea1dd2efa24375a148817a974c8727f4b0","https://github.com/centrifugal/centrifugo/releases/tag/v6.9.0"],"weaknesses":["CWE-290"],"ingestedAt":"2026-10-29T20:12:49.727Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/71xxx/CVE-2026-71485.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-71485","state":"PUBLISHED","datePublished":"2026-08-20T21:01:00.931Z","dateUpdated":"2026-08-25T15:23:47.006Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-08-06T19:56:23.725Z"},"containers":{"cna":{"title":"Centrifugo: Client-forgeable headers emulation lets any client spoof headers forwarded to proxy backends","descriptions":[{"lang":"en","value":"Centrifugo is an open-source scalable real-time messaging server. Prior to 6.9.0, Centrifugo copies the client-controlled protocol.ConnectRequest.headers map through OnClientConnecting in internal/client/handler.go, ConnectEvent.Headers, and SetEmulatedHeadersToContext. The requestHeaders path in internal/proxy/http.go, the requestMetadata path in internal/proxy/grpc.go, and the Consume path in internal/unigrpc/grpc.go can forward an allowlisted value as a trusted backend header or metadata value. A remote client can spoof a header such as x-trusted-user for connect, refresh, subscribe, publish, RPC, and related proxy calls when the backend relies on that header for authentication or authorization. The unidirectional gRPC transport has no transport-level HTTP header that can override the emulated value. This issue is fixed in version 6.9.0."}],"affected":[{"vendor":"centrifugal","product":"centrifugo","versions":[{"version":"< 6.9.0","status":"affected"}]}],"references":[{"url":"https://github.com/centrifugal/centrifugo/security/advisories/GHSA-9468-v6mj-fppw","name":"https://github.com/centrifugal/centrifugo/security/advisories/GHSA-9468-v6mj-fppw","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/centrifugal/centrifugo/pull/1182","name":"https://github.com/centrifugal/centrifugo/pull/1182","tags":["x_refsource_MISC"]},{"url":"https://github.com/centrifugal/centrifugo/commit/84d38cea1dd2efa24375a148817a974c8727f4b0","name":"https://github.com/centrifugal/centrifugo/commit/84d38cea1dd2efa24375a148817a974c8727f4b0","tags":["x_refsource_MISC"]},{"url":"https://github.com/centrifugal/centrifugo/releases/tag/v6.9.0","name":"https://github.com/centrifugal/centrifugo/releases/tag/v6.9.0","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":9.1,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-290","lang":"en","description":"CWE-290: Authentication Bypass by Spoofing","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-08-20T21:01:00.931Z"},"source":{"advisory":"GHSA-9468-v6mj-fppw","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-25T15:23:30.574802Z","id":"CVE-2026-71485","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-08-25T15:23:47.006Z"}}]}}}